Operation control method of energy storage equipment and related device

Abstract

The invention discloses an operation control method of energy storage equipment and a related device. The method comprises the following steps: acquiring an operation state and a first charge state of the energy storage equipment at a first moment; if the first charge state of the energy storage equipment in the charging state is not less than the first charging charge state or the first charge state of the energy storage equipment in the discharging state is not greater than the first discharging charge state, acquiring first operation current, first operation power and charge capacity of the energy storage equipment at a first moment; determining a first target current according to the first operation current, and determining a first target power according to the first operation power; determining a first target duration according to the first charge state, the charge capacity and the first target current; and controlling the operation of the energy storage equipment according to the first target current, the first target power and the first target duration. By implementing the steps in the method, the charge and discharge depth of the energy storage equipment can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage device control, and in particular to an operation control method of energy storage device and related devices. Background Art

[0002] The energy storage system usually includes multiple energy storage devices, multiple power consumption devices, and power management devices that control multiple energy storage devices. Multiple energy storage devices and multiple power consumption devices are connected through a microgrid, which is in turn connected to the mains network. The power management device controls the charging or discharging of multiple energy storage devices to store excess power provided by the mains network to multiple power consumption devices, thereby supplying the power consumption devices with the power stored in multiple energy storage devices when the mains network is insufficiently supplied. Alternatively, the power stored in multiple energy storage devices can be sold to the mains network when there is profit.

[0003] During the daily operation of the energy storage system, the energy storage device will experience battery polarization due to battery aging, environmental deterioration and other reasons. Polarization voltage refers to the voltage change caused by the electrochemical process inside the battery. When the battery is discharging or charging, the electrochemical reaction inside the battery, ion migration, and the reaction between the electrolyte and the electrode interface will cause a drop in voltage. This drop is called polarization voltage. It is an important part of the difference between the actual voltage of the battery and the open circuit voltage. Affected by battery polarization, according to the constant power charging and discharging process in the prior art, the increase in the charging and discharging voltage of the energy storage device during operation due to battery polarization will cause the energy storage device to reach the voltage threshold ahead of time. In order to ensure the safe operation of the energy storage device, the energy storage device will stop charging and discharging in advance, resulting in the problem of reduced charging and discharging depth of the energy storage device. Summary of the invention

[0004] In view of the above problems, the embodiments of the present application provide an operation control method and related devices for an energy storage device. The use of the solution of the present application is conducive to improving the charge and discharge depth of the energy storage device.

[0005] To achieve the above-mentioned purpose, in a first aspect, an embodiment of the present application provides an operation control method for an energy storage device, the method is applied to an energy management device of an energy storage system, the energy storage system also includes an energy storage device, the method includes: obtaining an operation state and a first state of charge of the energy storage device at a first moment, the operation state includes a charging state or a discharging state; if the first state of charge of the energy storage device in the charging state is not less than the first charging state of charge or the first state of charge of the energy storage device in the discharging state is not greater than the first discharging state of charge, then obtaining a first operation current, a first operation power and a charge capacity of the energy storage device at the first moment, the first charging state of charge being greater than the first discharging state of charge; determining a first target current according to the first operation current, and determining a first target power according to the first operation power; wherein the first target current is less than the first operation current, and the first target power is less than the first operation power; determining a first target duration according to the first state of charge, the charge capacity and the first target current, the first target duration being the duration required for the energy storage device to reach a cut-off state from the first moment according to the first target current and the first target power, the cut-off state including a charging completion state or a discharging completion state; and controlling the operation of the energy storage device according to the first target current, the first target power and the first target duration.

[0006] It can be seen that in the embodiment of the present application, by reducing the first target time corresponding to the current and power operation of the energy storage device when the state of charge of the energy storage device is not less than the first charging state of charge or not greater than the first discharging state of charge, the influence of the energy storage device due to battery polarization is reduced while ensuring the safe operation of the energy storage device, thereby improving the charge and discharge depth of the energy storage device.

[0007] In combination with the first aspect, in a possible embodiment, the first target current is determined according to the first operating current, and the first target power is determined according to the first operating power, including: obtaining a first attenuation parameter, the first attenuation parameter is a positive number less than 1; determining the product of the first operating current and the first attenuation parameter as the first target current; determining the product of the first operating power and the first attenuation parameter as the first target power.

[0008] It can be seen that in the embodiment of the present application, the current and power of the energy storage device are reduced by the first attenuation parameter, thereby reducing the impact of battery polarization on the energy storage device, thereby improving the charge and discharge depth of the energy storage device.

[0009] In combination with the first aspect, in a possible embodiment, determining a first target duration according to a first state of charge, a charge capacity, and a first target current includes: obtaining a first operating voltage of an energy storage device at a first moment, and a first relationship between the state of charge of the energy storage device and an open circuit voltage; determining a voltage rise of the energy storage device due to a polarization effect according to the first state of charge, the first operating voltage, and the first relationship; obtaining a cut-off open circuit voltage of the energy storage device, the cut-off open circuit voltage being an open circuit voltage corresponding to a second charging state of charge when the energy storage device is in a fully charged state, or an open circuit voltage corresponding to a second discharging state of charge when the energy storage device is in a fully discharged state, the second charging state of charge being greater than the first charging state of charge, and the second discharging state of charge being less than the first discharging state of charge; determining a target state of charge corresponding to the energy storage device according to the cut-off open circuit voltage and the voltage rise, the target state of charge being a state of charge that is closest to the state of charge of the energy storage device in the cut-off state that can be achieved by the energy storage device under the influence of the voltage rise; and determining the time required for the energy storage device to reach the target state of charge according to the first state of charge, the first target current, and the charge capacity as the first target duration.

[0010] It can be seen that in the embodiment of the present application, the current voltage rise of the energy storage device due to battery polarization is determined by the first relationship between the open circuit voltage and the state of charge of the energy storage device. Therefore, when calculating the first target time, the influence of the voltage rise caused by battery polarization on the energy storage device is taken into account, thereby improving the accuracy of the first target time, and further improving the operating efficiency of the subsequent energy storage device operating according to the first target current and the first target power.

[0011] In combination with the first aspect, in a possible embodiment, the energy storage device includes multiple single cells, and obtaining the first operating voltage of the energy storage device at a first moment includes: obtaining the second operating voltage of each of the multiple single cells at the first moment, determining the second operating voltage of the target cell as the first operating voltage, and the target cell is the cell with the highest second operating voltage among the multiple single cells; determining the voltage rise of the energy storage device due to the polarization effect according to the first state of charge, the first operating voltage and the target correspondence, including: determining the state of charge of the target cell according to the first state of charge; determining the theoretical open circuit voltage of the target cell according to the state of charge of the target cell and the target correspondence; and determining the difference between the second operating voltage of the target cell and the theoretical open circuit voltage of the target cell as the voltage rise of the energy storage device due to the polarization effect.

[0012] It can be seen that in the embodiment of the present application, the operating voltage and voltage rise of the battery cell with the largest operating voltage in the energy storage device are used as the operating voltage and voltage rise of the energy storage device, so that when the power management device controls the operation of the energy storage device according to the first target current, the first target power and the first target duration, the open circuit voltage of the single battery cell in the energy storage device that is most seriously affected by the battery polarization will not exceed the voltage limit, thereby avoiding the single battery cell in the energy storage device from entering the overcharge state, thereby ensuring the safe operation of the energy storage device.

[0013] In combination with the first aspect, in a possible embodiment, the operation of the energy storage device is controlled according to the first target current, the first target power and the first target duration, including: determining a second target duration according to the first target duration, the second target duration is less than the first target duration; if the second target duration is greater than a preset duration, the energy storage device is controlled to operate at the first target current and the first target power for the second target duration; if the second target duration is not greater than the preset duration, the energy storage device is controlled to operate at the first operating current and the first operating power until the energy storage device reaches a cut-off state.

[0014] It can be seen that in the embodiment of the present application, based on the second target time corresponding to the first target time required for the energy storage device to reach the charge state corresponding to the cut-off state from the current charge state, it is judged whether the current and power need to be further reduced, so as to further reduce the influence of battery polarization. When the second target time is longer than the preset time, it is considered that the current and power need to be further reduced, so as to further reduce the influence of battery polarization on the energy storage device, and further improve the charge and discharge depth of the energy storage device. When the second target time is not longer than the preset time, it is considered that there is no need to further reduce the current and power, so as to reduce the time required for charging and discharging of the energy storage device, and improve the operating efficiency of the energy storage device.

[0015] In combination with the first aspect, in a possible embodiment, determining the second target duration based on the first target duration includes: obtaining a second attenuation parameter, where the second attenuation parameter is a positive number less than 1; calculating the product of the first target time and the second attenuation parameter; obtaining the minimum unit time of the energy storage system; rounding down the product of the first target time and the second attenuation parameter according to the minimum unit time to obtain the second target time.

[0016] It can be seen that in the embodiment of the present application, a smaller second target time is determined based on the first target time so that the energy storage device will not reach the cut-off state after operating according to the first target current and the first target power, and the current and power of the energy storage device can be further reduced after the second target time, thereby further reducing the impact of battery polarization on the energy storage device, and further improving the charge and discharge depth of the energy storage device. The second target time is rounded down by the minimum unit time to match the energy storage system, thereby ensuring the stable operation of the energy storage system.

[0017] In combination with the first aspect, in a possible embodiment, after controlling the energy storage device to operate according to the first target current and the first target power for the second target time, the method also includes: obtaining the second operating current, the second operating power and the second state of charge of the energy storage device at the second moment, the first moment and the second moment are separated by the second target time; determining the second target current according to the second operating current, and determining the second target power according to the second operating power; wherein the target current is less than the second operating current, and the target power is less than the second operating power; determining the third target time according to the second state of charge, the charge capacity and the second target current, the third target time being the time required for the energy storage device to reach the cut-off state from the second moment according to the second target current and the second target power; and controlling the operation of the energy storage device according to the second target current, the second target power and the third target time.

[0018] It can be seen that in the embodiment of the present application, based on the first attenuation parameter and the second attenuation parameter, the point current and power of the energy storage device are optimized multiple times, so as to minimize the impact of battery polarization on the energy storage device, thereby maximizing the charge and discharge depth of the energy storage device.

[0019] In a second aspect, an embodiment of the present application provides an electric energy management device for executing an operation control method of an energy storage device, an operation control device of an energy storage device for executing an operation control method of an energy storage device, the device belongs to an energy storage system, and the energy storage system also includes an energy storage device, and the device includes:

[0020] The electric energy management device is used to execute the operation control method of the energy storage device. The device belongs to the electric energy management device of the energy storage system. The energy storage system also includes the energy storage device. The device includes:

[0021] An acquisition unit, used to acquire an operating state and a first state of charge of the energy storage device at a first moment, where the operating state includes a charging state or a discharging state;

[0022] an acquisition unit, configured to acquire a first operating current, a first operating power, and a charge capacity of the energy storage device at a first moment if the first state of charge of the energy storage device in the charging state is not less than the first charging state of charge or the first state of charge of the energy storage device in the discharging state is not greater than the first discharging state of charge, and the first charging state of charge is greater than the first discharging state of charge;

[0023] a determination unit, configured to determine a first target current according to the first operating current, and to determine a first target power according to the first operating power; wherein the first target current is less than the first operating current, and the first target power is less than the first operating power;

[0024] a determining unit, configured to determine a first target duration according to the first state of charge, the charge capacity, the first target power, and the first target current, wherein the first target duration is the duration required for the energy storage device to reach a cut-off state from the first moment according to the first target current and the first target power, wherein the cut-off state includes a charging completion state or a discharging completion state;

[0025] A control unit is used to control the operation of the energy storage device according to a first target current, a first target power and a first target duration.

[0026] In a third aspect, an embodiment of the present application provides an electronic device, comprising a processor, a memory, a communication interface, and one or more programs, wherein the one or more computer programs are stored in the memory and configured to be executed by the processor, and the one or more computer programs are used to execute part or all of the method of the first aspect.

[0027] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program enables a processor to execute part or all of the method of the first aspect.

[0028] In a fifth aspect, the present application provides a computer program product. When a computer reads and executes the computer program product, the computer executes the method in any possible design of the first aspect above.

[0029] It can be understood that the beneficial effects of the embodiments of the second to fifth aspects can refer to the beneficial effects of the method of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of an application scenario of an operation control method of an energy storage device provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of a flow chart of an operation control method of an energy storage device provided in an embodiment of the present application;

[0033] Figure 3 A schematic diagram of the internal structure of a battery cluster provided in an embodiment of the present application;

[0034] Figure 4A schematic diagram of a flow chart of another operation control method of an energy storage device provided in an embodiment of the present application;

[0035] Figure 5 A schematic diagram of a process flow of multiple cycles of optimization provided in an embodiment of the present application;

[0036] Figure 6 A schematic diagram of the structure of an operation control device for an energy storage device provided in an embodiment of the present application;

[0037] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] The embodiments of the present application are described below in conjunction with the accompanying drawings.

[0042] See also Figure 1 , Figure 1A schematic diagram of an application scenario of an operation control method of an energy storage device provided in an embodiment of the present application, wherein the application scenario 100 includes an energy management device 101 and an energy storage device 102. The energy management device 101 here is specifically an energy management system (Energy Management System, EMS), and the energy storage device 102 here is specifically a battery cluster or battery module in an energy storage cabinet, including a plurality of single cells connected in series or in parallel. The energy storage device 102 is specifically installed in an energy storage cabinet or is respectively installed in a plurality of energy storage cabinets. Only three energy storage devices are shown here, and more or fewer energy storage devices 102 may be included in actual scenarios.

[0043] The power management device 101 and the energy storage device 102 are connected to the microgrid in the energy storage system. The microgrid here is specifically the power supply system of a specific location such as a factory, school, or residential area. The microgrid can be connected to the external mains network. Therefore, the power management device 101 is used to control the energy storage device 102 to charge and store the electric energy input from the mains network, or to control the energy storage device 102 to discharge and release the stored electric energy to the mains network or the power-consuming equipment in the microgrid.

[0044] In the embodiment of the present application, the power management device 101 obtains the operating state and the first state of charge of the energy storage device 102 at the first moment. The energy storage device 102 here is specifically one of the multiple energy storage devices 102 in the application scenario 100. The operating state here includes the charging state or the discharging state.

[0045] If the first state of charge of the energy storage device 102 in the charging state is not less than the first charging state of charge or the first state of charge of the energy storage device in the discharging state is not greater than the first discharging state of charge, the power management device 101 obtains the first operating current, the first operating power and the charging capacity of the energy storage device 102 at the first moment, and the first charging state of charge is greater than the first discharging state of charge; the first state of charge here is a state of charge corresponding to a state close to the charging completion state, for example, when the energy storage device 102 reaches a state of charge of 95% in the charging state, the charging is completed. At this time, the first discharging state of charge can be 90%, 85%, 80%, etc. The second state of charge here is a state of charge corresponding to a state close to the discharging completion state, for example, when the energy storage device 102 reaches a state of charge of 5% in the discharging state, the charging is completed. At this time, the second discharging state of charge can be 10%, 15%, 20%, etc.

[0046] The power management device 101 determines the first target current according to the first operating current, and determines the first target power according to the first operating power; wherein the first target current is less than the first operating current, and the first target power is less than the first operating power. Here, the first target current can be determined according to the first operating current, and the first target power can be determined according to the first operating power by scaling down or subtracting a preset value.

[0047] The power management device 101 determines a first target duration according to the first state of charge, the charge capacity and the first target current. The first target duration is the time required for the energy storage device 102 to reach a cut-off state from the first moment according to the first target current and the first target power. The cut-off state includes a charging completion state or a discharging completion state. The first target duration here is the time required for the energy storage device 102 to complete charging or discharging according to the first target current and the first target power from the first moment.

[0048] The power management device 101 controls the operation of the energy storage device 102 according to the first target current, the first target power and the first target duration, thereby reducing the operating current and the operating power of the energy storage device 102 in the charging state or the discharging state, thereby reducing the impact of the battery polarization effect of the energy storage device 102.

[0049] It can be seen that in the embodiment of the present application, by reducing the operating power and current when the state of charge of the energy storage device is not less than the first charging state of charge or not greater than the first discharging state of charge, the influence of the energy storage device due to battery polarization is reduced, thereby improving the charge and discharge depth of the energy storage device.

[0050] See also Figure 2 , Figure 2 A schematic diagram of a flow chart of an operation control method of an energy storage device provided in an embodiment of the present application, which can be based on Figure 1 The application scenario shown is implemented as follows Figure 2 As shown, steps S201-S205 are included:

[0051] S201: The power management device obtains the operating state and the first state of charge of the energy storage device at the first moment, where the operating state includes a charging state or a discharging state.

[0052] Specifically, during the operation of the energy storage device, that is, when the energy storage device is in a charging state or a discharging state, the power management device will continuously obtain the first state of charge of the energy storage device. The state of charge refers to the ratio of the remaining power of the battery in the current state to the capacity in the fully charged state, usually expressed as a percentage. The power management device will also obtain the operating state of the energy storage device, that is, the charging state or the discharging state, so as to determine the current power of the energy storage device and then decide whether to execute the subsequent steps.

[0053] S202: If the first state of charge of the energy storage device in the charging state is not less than the first charging state of charge or the first state of charge of the energy storage device in the discharging state is not greater than the first discharging state of charge, the power management device obtains the first operating current, the first operating power and the charging capacity of the energy storage device at the first moment, and the first charging state of charge is greater than the first discharging state of charge.

[0054] Specifically, when the first state of charge of the energy storage device in the charging state is not less than the first charging state of charge or the first state of charge of the energy storage device in the discharging state is not greater than the first discharging state of charge, that is, the battery enters the final stage of charge and discharge, due to the battery polarization of the single cell in the energy storage device, the open circuit voltage of the energy storage device will produce a voltage rise, so that the energy storage device enters the trigger voltage threshold ahead of time due to the increase in the open circuit voltage, and ends charging ahead of time, thereby reducing the charge and discharge depth of the energy storage device.

[0055] Therefore, the battery enters the final stage of charge and discharge, and the energy management device obtains the first operating current, the first operating power and the charge capacity of the energy storage device at the first moment to perform subsequent steps such as determining the first target current and determining the first target power.

[0056] For example, if the energy storage device is in a charging state, the first state of charge is 90%, if the first charging state of charge of the energy storage device is 95%, at this time the first state of charge of the energy storage device is less than the first charging state of charge, the energy storage device continues to charge. When the first state of charge is not less than the first charging state of charge in the charging state, that is, the first state of charge is greater than or equal to 95%, step S203 and subsequent steps are therefore executed.

[0057] S203: The power management device determines a first target current according to the first operating current, and determines a first target power according to the first operating power; wherein the first target current is smaller than the first operating current, and the first target power is smaller than the first operating power.

[0058] Specifically, in an embodiment of the present application, a first target current less than the first operating current and a first target power less than the first operating power are determined by the first operating current and the first operating power, respectively. This is because in an electrochemical reaction, the larger the current, the easier it is to accumulate charge on the electrode surface, causing the polarization voltage of the electrode to rise. An increase in current typically leads to a stronger interaction between the electrolyte and the electrode, which may increase the polarization voltage. Conversely, reducing the current means a lower rate of charge accumulation, thereby reducing the generation of polarization voltage. Therefore, when the energy storage device operates at the first operating current and the first operating power, the voltage rise generated by the corresponding polarization voltage is reduced, and the energy storage device can enter the trigger voltage threshold later, thereby increasing the depth of charge and discharge.

[0059] In a possible embodiment, a first target current is determined based on a first operating current, and a first target power is determined based on a first operating power, including: obtaining a first attenuation parameter, where the first attenuation parameter is a positive number less than 1; determining the product of the first operating current and the first attenuation parameter as the first target current; and determining the product of the first operating power and the first attenuation parameter as the first target power.

[0060] Specifically, in an embodiment of the present application, the first target current and the first target power are calculated by a first attenuation parameter. The first attenuation parameter is a positive number less than 1, that is, a first attenuation parameter α, α∈(0,1). The first attenuation parameter here is set in advance and stored in the power management device, or is determined by the power management device based on the remaining available charge and discharge time. The remaining charge and discharge time here is the time that the energy storage device determined by the power management device can maintain the current operating state. The remaining available charge and discharge is negatively correlated with the value of the first attenuation parameter.

[0061] Exemplarily, if the first operating current is -330A (a positive number represents a charging current, and a negative number represents a discharging current), and the first attenuation parameter α is 0.9, the first target current here is -330A×0.9=-297A.

[0062] If the first operating power is -384kw (a positive number represents a charging current, and a negative number represents a discharging current), and the first attenuation parameter α is 0.9, the first target current here is -384A×0.9=-345.6kw.

[0063] Furthermore, in order to prevent the charging and discharging time of the energy storage device from being too long, the minimum value of the first attenuation parameter here is 0.5.

[0064] It can be seen that in the embodiment of the present application, the current and power of the energy storage device are reduced by the first attenuation parameter, thereby reducing the impact of battery polarization on the energy storage device, thereby improving the charge and discharge depth of the energy storage device.

[0065] S204: The power management device determines a first target duration according to the first state of charge, the charge capacity, the first target power and the first target current. The first target duration is the duration required for the energy storage device to reach a cut-off state from the first moment according to the first target current and the first target power. The cut-off state includes a charging completion state or a discharging completion state.

[0066] Specifically, if the energy storage device is in a charging state, the first target duration refers to the time required for the energy storage device to operate at the first target power and the first target current, from the first charge state to the cut-off state, that is, to complete charging to the corresponding charge state.

[0067] If the energy storage device is in a discharging state, the first target duration refers to the time required for the energy storage device to operate at the first target power and the first target current, from the first charge state to the cut-off state, that is, the time required for the charge state corresponding to the discharge to be completed.

[0068] In a possible embodiment, determining a first target duration according to a first state of charge, a charge capacity, and a first target current includes: obtaining a first operating voltage of an energy storage device at a first moment, and a first relationship between the state of charge and an open circuit voltage of the energy storage device; determining a voltage rise of the energy storage device due to a polarization effect according to the first state of charge, the first operating voltage, and the first relationship; obtaining a cut-off open circuit voltage of the energy storage device, the cut-off open circuit voltage being an open circuit voltage corresponding to a second charging state of charge when the energy storage device is in a fully charged state, or an open circuit voltage corresponding to a second discharging state of charge when the energy storage device is in a fully discharged state, the second charging state of charge being greater than the first charging state of charge, and the second discharging state of charge being less than the first discharging state of charge; determining a target state of charge corresponding to the energy storage device according to the cut-off open circuit voltage and the voltage rise, the target state of charge being a state of charge that is closest to the state of charge of the energy storage device in the cut-off state that can be achieved by the energy storage device under the influence of the voltage rise; and determining a time required for the energy storage device to reach the target state of charge according to the first state of charge, the first target current, and the charge capacity as the first target duration.

[0069] Specifically, due to the voltage rise caused by battery polarization, the energy storage device cannot actually reach the state of charge corresponding to the initial cut-off state during the charging and discharging process. For example, if the state of charge corresponding to the cut-off state (i.e., the charging complete state or the discharging complete state, in this example, the charging complete state) of the energy storage battery initially set in the charging state is 100%, due to the influence of battery polarization on the energy storage device, the actual maximum state of charge of the energy storage device is only 98%. Therefore, at this time, the state of charge corresponding to the cut-off state of the energy storage battery in the actual charging state is 98%, that is, the state of charge that can be achieved under the influence of voltage rise as described in the embodiment of the present application and is closest to the state of charge of the energy storage device in the cut-off state.

[0070] Therefore, when calculating the first target duration of the energy storage device, the power management device also obtains the first operating voltage of the energy storage device at the first moment, as well as the first relationship between the state of charge of the energy storage device and the open circuit voltage; the open circuit voltage is the terminal voltage of the energy storage device in the open circuit state. There is a positive correlation between the state of charge of the energy storage device and the open circuit voltage. The first relationship here is calibrated by testing the energy storage device, in which the corresponding relationship between the state of charge of the energy storage device and the open circuit voltage is recorded. For example, when the state of charge is 10%, the corresponding open circuit voltage is 3.210v, and when the state of charge is 90%, the corresponding open circuit voltage is 3.343v, etc.

[0071] The power management device calculates the current theoretical open circuit voltage of the energy storage device based on the first state of charge and the first relationship, and calculates the first open circuit voltage of the energy storage device based on the first operating voltage. Here, the first open circuit voltage of the energy storage device can be calculated based on the first operating voltage according to parameters such as the battery internal resistance and operating temperature of the energy storage device. Then, the voltage rise of the energy storage device due to the polarization effect is determined based on the difference between the first open circuit voltage and the theoretical open circuit voltage.

[0072] For example, if the first open circuit voltage of the energy storage device is 3.61 V and the first state of charge is 95%, the corresponding theoretical open circuit voltage is 3.3466 V. The voltage rise ΔU of the energy storage device due to the polarization effect satisfies the following formula (1):

[0073] ΔU=U max -U ocv =3.61-3.3466=0.2634V (1)

[0074] Among them, U max is the first open circuit voltage, U ocv is the theoretical open circuit voltage.

[0075] Obtain the cut-off open circuit voltage of the energy storage device, where the cut-off open circuit voltage is the open circuit voltage corresponding to the actual maximum or minimum state of charge of the energy storage device. The power management device determines the cut-off open circuit voltage corresponding to the actual maximum or minimum state of charge through the first relationship. The specific meaning of the actual maximum or minimum state of charge is as described above and will not be repeated here. If the energy storage device is in the charging state, the cut-off open circuit voltage is the open circuit voltage corresponding to the actual maximum state of charge in the first relationship; if the energy storage device is in the discharging state, the cut-off open circuit voltage is the open circuit voltage corresponding to the actual minimum state of charge in the first relationship.

[0076] The target state of charge corresponding to the energy storage device is determined based on the cut-off open circuit voltage and voltage rise. The target state of charge is the state of charge that the energy storage device can achieve under the influence of voltage rise and is closest to the state of charge of the energy storage device in the cut-off state. That is, the actual maximum state of charge or the actual minimum state of charge of the energy storage device

[0077] For example, in the charging state, if the initial state of charge of the energy storage device is 100%, the corresponding open circuit voltage is 3.65v, and the voltage rises to 0.2634v. Therefore, the actual open circuit voltage that the energy storage device can use for charging under the influence of battery polarization is 3.65v-0.2634v=3.3866v. The state of charge in the cut-off state here is closest to the actual maximum state of charge, which is 98.94% of the corresponding state of 3.3866v in the first relationship. It can be seen that due to the voltage rise caused by the polarization effect, the state of charge of the energy storage device after charging has dropped from the initial 100% to 98.94%.

[0078] The time required for the energy storage device to reach the target state of charge according to the first state of charge, the first target current and the charge capacity is determined as the first target time. The first target time t satisfies the following formula (2):

[0079]

[0080] Among them, Q is the charge capacity, SOC t is the first state of charge, I t is the first target current.

[0081] It can be seen that in the embodiment of the present application, the current voltage rise of the energy storage device due to battery polarization is determined by the first relationship between the open circuit voltage and the state of charge of the energy storage device. Therefore, when calculating the first target time, the influence of the voltage rise caused by battery polarization on the energy storage device is taken into account, thereby improving the accuracy of the first target time, and further improving the operating efficiency of the subsequent energy storage device operating according to the first target current and the first target power.

[0082] In a possible embodiment, if the energy management device also includes a second relationship between the operating parameters of the energy storage device and the ohmic polarization voltage rise, a third relationship between the operating parameters and other polarization voltage rises, the operating parameters include at least one of the operating current, the operating voltage and the operating power, and the other polarization voltage rise includes a concentration difference polarization voltage rise or an electrochemical polarization voltage rise, the method also includes: determining the ohmic polarization voltage rise and other polarization voltage rises of the energy storage device according to the operating parameters, the second relationship and the third relationship; determining the voltage rise of the energy storage device due to the polarization effect according to the ohmic polarization voltage rise and the other polarization voltage rise.

[0083] Specifically, in the embodiment of the present application, the power management device also saves the second relationship between the operating parameters of the energy storage device and the ohmic polarization voltage rise, and the third relationship between the operating parameters and other polarization voltage rises. Therefore, it is not necessary to determine the voltage rise of the energy storage device due to the polarization effect based on the first state of charge, the first operating voltage and the first relationship, but to determine the ohmic polarization voltage rise and other polarization voltage rises of the energy storage device based on the operating parameters, the second relationship and the third relationship, and then determine the voltage rise of the energy storage device due to the polarization effect based on the ohmic polarization voltage rise and other polarization voltage rise. To achieve the subsequent steps.

[0084] Exemplarily, the energy management device of the energy storage device also includes a second relationship between the operating parameters of the energy storage device and the ohmic polarization voltage rise, and a third relationship between the operating parameters and other polarization voltage rises. The voltage rise ΔU of the energy storage device due to the polarization effect satisfies the following formula (3):

[0085] ΔU=U p +IR0 (3)

[0086] Among them, U p is the voltage rise for other polarizations, and IR0 is the voltage rise for ohmic polarization.

[0087] In a possible embodiment, the energy storage device includes multiple single cells, and obtaining the first operating voltage of the energy storage device at a first moment includes: obtaining the second operating voltage of each of the multiple single cells at the first moment, determining the second operating voltage of the target cell as the first operating voltage, and the target cell is the single cell with the highest second operating voltage among the multiple single cells; determining the voltage rise of the energy storage device due to the polarization effect according to the first state of charge, the first operating voltage and the target corresponding relationship, including: determining the state of charge of the target cell according to the first state of charge; determining the theoretical open circuit voltage of the target cell according to the state of charge of the target cell and the target corresponding relationship; and determining the difference between the second operating voltage of the target cell and the theoretical open circuit voltage of the target cell as the voltage rise of the energy storage device due to the polarization effect.

[0088] Specifically, Figure 1 The energy storage device 102 shown is specifically a battery cluster or a battery module, see Figure 3 , Figure 3 The internal structure diagram of a battery cluster provided in an embodiment of the present application is shown in FIG. 300 . The battery cluster 300 includes a battery module 301 and a communication bus 302 . The battery module 301 also includes a plurality of single cells connected in parallel or in series. Figure 3As shown, in the embodiment of the present application, the battery module 301 in the battery cluster 300 inputs or outputs electric energy to the outside (usually inputs or outputs electric energy to the microgrid) in series, and the single cells in each battery module 301 are also connected in series. Each battery module is connected to the power management device through the communication bus 302 here, wherein the specifications and models of all single cells are the same. Therefore, in the process of charging and discharging of the battery cluster 300 according to the instructions of the power management device, each single cell in each battery module 301 in the battery cluster 300 operates with approximately the same operating parameters such as current, voltage and power. However, after long-term operation, due to the slightly different operating environment and operating parameters of each single cell, the influence of battery polarization on each single cell is also different, and the corresponding voltage rise also has differences.

[0089] Therefore, in the embodiment of the present application, the second operating voltage of each single cell in the multiple single cells in the energy storage device at the first moment is obtained, and the voltage of the single cell with the largest second operating voltage is determined as the first operating voltage of the energy storage device. And in the subsequent process of determining the voltage rise of the energy storage device due to the polarization effect according to the first state of charge, the first operating voltage and the target correspondence, the voltage rise of the single cell due to battery polarization is calculated in the same way, and the difference between the second operating voltage of the target cell and the theoretical open circuit voltage of the target cell is determined as the voltage rise of the energy storage device due to the polarization effect.

[0090] It can be seen that in the embodiment of the present application, the operating voltage and voltage rise of the battery cell with the largest operating voltage in the energy storage device are used as the operating voltage and voltage rise of the energy storage device, so that when the power management device controls the operation of the energy storage device according to the first target current, the first target power and the first target duration, the open circuit voltage of the single battery cell in the energy storage device that is most seriously affected by the battery polarization will not exceed the voltage limit, thereby avoiding the single battery cell in the energy storage device from entering the overcharge state, thereby ensuring the safe operation of the energy storage device.

[0091] S205: The power management device controls the operation of the energy storage device according to the first target current, the first target power and the first target duration.

[0092] Specifically, the power management device can control the energy storage device to operate for the first target operating time according to the first target current and the first target power, so as to achieve the cut-off state described above. Or the energy storage device can be controlled to operate intermittently (continuously switch between operating and standby states) according to the first target current and the first target power, so that the actual operating time of the energy storage device is the first target duration.

[0093] In the above application embodiment, a method is described in which an energy storage device operates for a first target time according to a first target current and a first target power to reduce the impact of battery polarization on the energy storage device. Based on this, the present application embodiment also provides an operation method based on a second target time. Figure 4 , Figure 4 A flow chart of another operation control method of an energy storage device provided in an embodiment of the present application can be based on Figure 1 The application scenario shown is implemented as follows Figure 4 As shown, steps S401-S406 are included:

[0094] S401: The power management device obtains the operating state and the first state of charge of the energy storage device at the first moment, where the operating state includes a charging state or a discharging state.

[0095] S402: If the first state of charge of the energy storage device in the charging state is not less than the first charging state of charge or the first state of charge of the energy storage device in the discharging state is not greater than the first discharging state of charge, the power management device obtains the first operating current, the first operating power and the charging capacity of the energy storage device at the first moment, and the first charging state of charge is greater than the first discharging state of charge.

[0096] S403: The power management device determines a first target current according to the first operating current, and determines a first target power according to the first operating power; wherein the first target current is smaller than the first operating current, and the first target power is smaller than the first operating power.

[0097] S404: The power management device determines a first target duration according to the first state of charge, the charge capacity, the first target power and the first target current. The first target duration is the duration required for the energy storage device to reach a cut-off state from the first moment according to the first target current and the first target power. The cut-off state includes a charging completion state or a discharging completion state.

[0098] For detailed description of steps S401-S404, please refer to the aforementioned steps S201-S204 and related descriptions, which will not be repeated here.

[0099] S405: Determine a second target duration based on the first target duration, the second target duration being less than the first target duration; if the second target duration is greater than the preset duration, the power management device controls the energy storage device to operate for the second target duration according to the first target current and the first target power.

[0100] Specifically, in the embodiment of the present application, the power management device does not directly control the energy storage device to run for the first target duration according to the first target current and the first target power, but determines a smaller second target duration according to the first target duration, so that the energy storage device stops before running to the cut-off state, and then further reduces the current and power according to the first attenuation parameter, thereby further reducing the impact of battery polarization on the energy storage device. If the second target duration is greater than the preset duration, the energy storage device is controlled to run for the second target duration according to the first target current and the first target power.

[0101] S406: If the second target duration is not greater than the preset duration, the power management device controls the energy storage device to operate according to the first operating current and the first operating power until the energy storage device reaches a cut-off state.

[0102] Specifically, if the second target duration is not greater than the preset duration, it proves that at this time the energy storage device still needs to charge or discharge a small amount of electricity to reach the cutoff state (i.e., the charging completion state or the discharging completion state), and the benefit of continuing to reduce the current and power to reduce the battery polarization is low. Therefore, there is no need to further reduce the current and power according to the first attenuation parameter to further reduce the battery polarization. At this time, it is only necessary to control the energy storage device to operate according to the first operating current and the first operating power until the energy storage device reaches the cutoff state.

[0103] It can be seen that in the embodiment of the present application, based on the second target time corresponding to the first target time required for the energy storage device to reach the charge state corresponding to the cut-off state from the current charge state, it is judged whether the current and power need to be further reduced, so as to further reduce the influence of battery polarization. When the second target time is longer than the preset time, it is considered that the current and power need to be further reduced, so as to further reduce the influence of battery polarization on the energy storage device, and further improve the charge and discharge depth of the energy storage device. When the second target time is not longer than the preset time, it is considered that there is no need to further reduce the current and power, so as to reduce the time required for charging and discharging of the energy storage device, and improve the operating efficiency of the energy storage device.

[0104] In a possible embodiment, determining the second target duration based on the first target duration includes: obtaining a second attenuation parameter, where the second attenuation parameter is a positive number less than 1; calculating the product of the first target time and the second attenuation parameter; obtaining the minimum unit time of the energy storage system; and rounding down the product of the first target time and the second attenuation parameter according to the minimum unit time to obtain the second target time.

[0105] Specifically, in the embodiment of the present application, the second target duration is determined by the second attenuation parameter, where the second attenuation parameter is a positive number less than 1, that is, the second attenuation parameter β, β∈(0,1). The second attenuation parameter here is the same as the first attenuation parameter, which is set in advance and stored in the power management device, or is determined by the power management device based on the remaining available charge and discharge time. The remaining charge and discharge time here is the time that the energy storage device determined by the power management device can maintain the current operating state. The remaining available charge and discharge is negatively correlated with the value of the second attenuation parameter. The numerical values ​​of the second attenuation parameter and the first attenuation parameter can be the same or different, and there is no restriction here.

[0106] In addition, the minimum time unit here is the minimum time unit for a running state to last in the energy storage system. For example, if the minimum charging and discharging unit time of the energy storage device is set to 5s in the energy storage system, the minimum unit time here is 5s. The power management device obtains the minimum unit time of the energy storage system; the product of the first target time and the second attenuation parameter is rounded down according to the minimum unit time to obtain the second target time. So that when the energy storage device is subsequently controlled to run according to the second target time, it matches the minimum unit time of the energy storage system.

[0107] For example, taking the first target duration t as 173.36s in the above example, if the second attenuation parameter β is 0.95 and the minimum charge and discharge unit duration is 5s, the corresponding second target duration t' satisfies the following formula (4);

[0108]

[0109] Wherein, dt[βt / dt] represents the rounding down of βt, and the minimum unit time of charge and discharge is dt.

[0110] It can be seen that in the embodiment of the present application, a smaller second target time is determined based on the first target time so that the energy storage device will not reach the cut-off state after operating according to the first target current and the first target power, and the current and power of the energy storage device can be further reduced after the second target time, thereby further reducing the impact of battery polarization on the energy storage device, and further improving the charge and discharge depth of the energy storage device. The second target time is rounded down by the minimum unit time to match the energy storage system, thereby ensuring the stable operation of the energy storage system.

[0111] In a possible embodiment, before obtaining the first attenuation parameter or obtaining the second attenuation parameter, the method also includes: obtaining the remaining operating time of the energy storage device, the remaining operating time being the maximum time for the energy storage device to maintain a current operating state, the operating state including a charging state or a discharging state; determining the first attenuation parameter and the second attenuation parameter according to the remaining operating time, the first attenuation parameter and the second attenuation parameter being positively correlated with the remaining operating time.

[0112] Specifically, in an embodiment of the present application, the power management device will also obtain the remaining operating time of the energy storage device, where the remaining operating time is the longest time that the energy storage device can maintain the current operating state. In the charging state, the remaining operating time is the time that the energy storage device can maintain the charging state; in the discharging state, the remaining operating time is the time that the energy storage device can maintain the discharging state. If there is an operation plan for the energy storage device in the power management device, the remaining operating time is obtained according to the operation schedule. This operation plan is preset in the energy storage system or set by the administrator of the energy storage system, which records the operating status and operating time of the energy storage device within the preset time (for example, a single day). The preset time includes the first moment.

[0113] If there is no operation plan for the energy storage device in the electric energy management device, the historical electricity price information and the current electricity price within the preset date in the past are obtained, and the historical highest electricity price and the historical lowest electricity price are determined according to the historical electricity price information; if the energy storage device is in a charging state and the current electricity price is lower than the historical lowest electricity price, the first attenuation parameter is determined as the first parameter value, and the second attenuation parameter is determined as the second parameter value; if the energy storage device is in a charging state and the current electricity price is higher than the historical highest electricity price, the first attenuation parameter is determined as the third parameter value, and the second attenuation parameter is determined as the fourth parameter value, the first parameter value is greater than the third parameter value, and the second parameter value is greater than the fourth parameter value; if the energy storage device is in a discharging state and the current electricity price is lower than the historical lowest electricity price, the first attenuation parameter is determined as the third parameter value, and the second attenuation parameter is determined as the fourth parameter value; if the energy storage device is in a discharging state and the current electricity price is higher than the historical highest electricity price, the first attenuation parameter is determined as the first parameter value, and the second attenuation parameter is determined as the second parameter value.

[0114] It can be seen that if there is no operation plan for the energy storage device in the power management device, the power management device selects different parameter values ​​of the first attenuation parameter and the second attenuation parameter according to the current electricity price, so as to achieve rapid discharge when the electricity price is high and rapid charging when the electricity price is low, thereby improving the revenue of the energy storage system.

[0115] In a possible embodiment, after controlling the energy storage device to operate for a second target time according to the first target current and the first target power, the method also includes: obtaining a second operating current, a second operating power, and a second state of charge of the energy storage device at a second moment, the first moment and the second moment being separated by a second target time; determining the second target current according to the second operating current, and determining the second target power according to the second operating power; wherein the target current is less than the second operating current, and the target power is less than the second operating power; determining a third target time according to the second state of charge, the charge capacity, and the second target current, the third target time being the time required for the energy storage device to reach a cut-off state from the second moment according to the second target current and the second target power; and controlling the operation of the energy storage device according to the second target current, the second target power, and the third target time.

[0116] Specifically, in an embodiment of the present application, after controlling the energy storage device to operate for the second target time according to the first target current and the first target power, the energy storage device operates for a period of time after reducing the influence of battery polarization, but has not yet reached the cut-off state. At this time, due to the change in the charge state of the energy storage device, the actual voltage rise of the energy storage device will also change. In order to further reduce the influence of battery polarization, the power management device will also perform the following operations.

[0117] The power management device obtains the second operating current, the second operating power and the second state of charge of the energy storage device at the second moment. The second operating current here is the first target current, and the second operating power here is the first target power.

[0118] The second target current is determined according to the second operating current, and the second target power is determined according to the second operating power. The third target duration is determined according to the second state of charge, the charge capacity, and the second target current. The third target duration is the time required for the energy storage device to reach the cut-off state from the second moment according to the second target current and the second target power. The determination process of the second target current, the second operating power, and the third target duration here, please refer to the aforementioned determination process and detailed description of the first target current, the first power, and the first target duration, which will not be repeated here.

[0119] The power management device controls the operation of the energy storage device according to the second target current, the second target power and the third target duration. Specifically, the energy storage device can be controlled to operate for the third target duration according to the second target current and the second target power. As the current and power of the energy storage device further decrease to the second target current and the second target power, the impact of battery polarization on the energy storage device will be further reduced, and the charge and discharge depth of the energy storage device will be further improved.

[0120] Furthermore, the further optimization process in the embodiment of the present application can be executed cyclically, see Figure 5 , Figure 5 A schematic diagram of a process flow of multiple optimization cycles provided in an embodiment of the present application, including steps S501-S507:

[0121] S501: Obtain the current state of charge and charge capacity of the energy storage device.

[0122] After the energy storage device operates according to the first target current and the second target current, the power management device first obtains the current state of charge (ie, the second state of charge) and charge capacity of the energy storage device.

[0123] S502: Determine a second target current according to the second operating current, and determine a second target power according to the second operating power.

[0124] S503: Determine a third target duration according to the first target current, the current state of charge, and the charge capacity.

[0125] In steps S502 to S503, the power management device determines the second target current and the second target power according to the first target current, and then determines the third target duration, which is the duration required to reach the cut-off state according to the current state of charge, the second target current and the second target power.

[0126] S504: Determine a fourth target duration according to the third target duration.

[0127] The fourth target duration is determined according to the third target duration. For the specific determination method, please refer to the aforementioned related instructions on determining the second target duration according to the first target duration, which will not be repeated here.

[0128] S505: The fourth target duration is less than the preset duration.

[0129] In this step, the power management device needs to determine whether the fourth target duration is less than the preset duration. If the fourth target duration is less than the preset duration, it can be known that the benefits of continuing to reduce the current and power to reduce battery polarization are low, so there is no need to continue to reduce the current and power of the energy storage device. At this time, step S506 is executed: control the energy storage device to operate according to the first target current and the first target power until the energy storage device reaches the cut-off state. Until the end, that is, the energy storage device reaches the cut-off state.

[0130] If the fourth target duration is not less than the preset duration, it is known that the subsequent reduction of current and the influence of power battery polarization on the energy storage device can be further reduced, and step S507 is executed at this time: the energy storage device is controlled to operate for the fourth target duration according to the second target current and the second target power. After the operation, the second target current and the second target power are used as the new first target current and the second target power, and the above steps of obtaining the current state of charge and charge capacity of the energy storage device are repeated until the new fourth target duration is less than the preset duration.

[0131] It can be seen that in the embodiment of the present application, based on the first attenuation parameter and the second attenuation parameter, the point current and power of the energy storage device are optimized multiple times, so as to minimize the impact of battery polarization on the energy storage device, thereby maximizing the charge and discharge depth of the energy storage device.

[0132] By implementing the method in the above-mentioned application embodiment, it can be seen that the charge and discharge depth of the energy storage device is improved by reducing the first target time corresponding to the current and power operation of the energy storage device. In the process of calculating the first target time, the impact of the voltage rise caused by battery polarization on the energy storage device is taken into account, thereby improving the accuracy of the first target time. The operating voltage and voltage rise of the battery cell with the largest operating voltage in the energy storage device are used as the operating voltage and voltage rise of the energy storage device, thereby ensuring the operating safety of the energy storage device. Whether the current and power need to be further reduced is determined based on the second target duration, thereby improving the operating efficiency of the energy storage device. The point current and power of the energy storage device are optimized multiple times to maximize the charge and discharge depth of the energy storage device.

[0133] Based on the description of the above configuration method embodiment, the present application also provides an operation control device 600 of an energy storage device. The operation control device 600 of the energy storage device can be operated at Figure 1 A computer program (including program code) in a processor of the power management device 101 shown in FIG. Figure 1 The application scenario shown in the figure is executed Figure 2 See the method shown in Figure 6 , Figure 6 A schematic diagram of the structure of an operation control device of an energy storage device provided in an embodiment of the present application, wherein the operation control device 600 of the energy storage device includes:

[0134] An acquisition unit 601 is used to acquire an operating state and a first state of charge of an energy storage device at a first moment, where the operating state includes a charging state or a discharging state;

[0135] An acquisition unit 601 is used to acquire a first operating current, a first operating power and a charge capacity of the energy storage device at a first moment if the first state of charge of the energy storage device in the charging state is not less than the first charging state of charge or the first state of charge of the energy storage device in the discharging state is not greater than the first discharging state of charge, and the first charging state of charge is greater than the first discharging state of charge;

[0136] A determination unit 602, configured to determine a first target current according to the first operating current, and to determine a first target power according to the first operating power; wherein the first target current is less than the first operating current, and the first target power is less than the first operating power;

[0137] A determining unit 602 is used to determine a first target duration according to the first state of charge, the charge capacity and the first target current, where the first target duration is the duration required for the energy storage device to reach a cut-off state from the first moment according to the first target current and the first target power, where the cut-off state includes a charging completion state or a discharging completion state;

[0138] The control unit 603 is used to control the operation of the energy storage device according to the first target current, the first target power and the first target duration.

[0139] In a possible embodiment, in terms of determining the first target current according to the first operating current and determining the first target power according to the first operating power, the acquisition unit 601 is also specifically used to: obtain a first attenuation parameter, the first attenuation parameter is a positive number less than 1; determine the product of the first operating current and the first attenuation parameter as the first target current; determine the product of the first operating power and the first attenuation parameter as the first target power.

[0140] In a possible embodiment, in terms of determining the first target duration according to the first state of charge, the charge capacity and the first target current, the acquisition unit 601 is further specifically used to: acquire a first operating voltage of the energy storage device at a first moment, and a first relationship between the state of charge and the open circuit voltage of the energy storage device; determine a voltage rise of the energy storage device due to a polarization effect according to the first state of charge, the first operating voltage and the first relationship; acquire a cut-off open circuit voltage of the energy storage device, the cut-off open circuit voltage being an open circuit voltage corresponding to a second charging state of charge when the energy storage device is in a fully charged state, or an open circuit voltage corresponding to a second discharging state of charge when the energy storage device is in a fully discharged state, the second charging state of charge being greater than the first charging state of charge, and the second discharging state of charge being less than the first discharging state of charge; determine a target state of charge corresponding to the energy storage device according to the cut-off open circuit voltage and the voltage rise, the target state of charge being a state of charge that the energy storage device can reach under the influence of the voltage rise and that is closest to the state of charge of the energy storage device in the cut-off state; and determine the time required for the energy storage device to reach the target state of charge according to the first state of charge, the first target current and the charge capacity as the first target duration.

[0141] In a possible embodiment, the energy storage device includes multiple single cells, and in terms of obtaining the first operating voltage of the energy storage device at the first moment, the acquisition unit 601 is further specifically used to: obtain the second operating voltage of each of the multiple single cells at the first moment, determine the second operating voltage of the target cell as the first operating voltage, and the target cell is the cell with the highest second operating voltage among the multiple single cells; determine the voltage rise of the energy storage device due to the polarization effect according to the first state of charge, the first operating voltage and the target corresponding relationship, including: determining the state of charge of the target cell according to the first state of charge; determining the theoretical open circuit voltage of the target cell according to the state of charge of the target cell and the target corresponding relationship; and determining the difference between the second operating voltage of the target cell and the theoretical open circuit voltage of the target cell as the voltage rise of the energy storage device due to the polarization effect.

[0142] In a possible embodiment, in terms of controlling the operation of the energy storage device according to the first target current, the first target power and the first target duration, the determination unit 602 is also specifically used to: determine the second target duration according to the first target duration, the second target duration is less than the first target duration; if the second target duration is greater than the preset duration, the energy storage device is controlled to operate at the first target current and the first target power for the second target duration; if the second target duration is not greater than the preset duration, the energy storage device is controlled to operate at the first operating current and the first operating power until the energy storage device reaches a cut-off state.

[0143] In a possible embodiment, in terms of determining the second target duration based on the first target duration, the acquisition unit 601 is also specifically used to: obtain a second attenuation parameter, which is a positive number less than 1; calculate the product of the first target time and the second attenuation parameter; obtain the minimum unit time of the energy storage system; round down the product of the first target time and the second attenuation parameter according to the minimum unit time to obtain the second target time.

[0144] In a possible embodiment, after controlling the energy storage device to operate according to the first target current and the first target power for the second target time, the acquisition unit 601 is further specifically used to: obtain the second operating current, the second operating power and the second state of charge of the energy storage device at the second moment, and the first moment and the second moment are separated by the second target time; determine the second target current according to the second operating current, and determine the second target power according to the second operating power; wherein the target current is less than the second operating current, and the target power is less than the second operating power; determine the third target time according to the second state of charge, the charge capacity and the second target current, and the third target time is the time required for the energy storage device to reach the cut-off state from the second moment according to the second target current and the second target power; and control the operation of the energy storage device according to the second target current, the second target power and the third target time.

[0145] Based on the description of the above method embodiment and device embodiment, please refer to Figure 7 , Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 7 The electronic device 700 shown (the electronic device 700 may be a specific electronic device) includes a memory 701, a processor 702, a communication interface 703 and a bus 704. The memory 701, the processor 702 and the communication interface 703 are connected to each other through the bus 704.

[0146] The memory 701 may be a read-only memory (ROM), a static storage device, a dynamic storage device or a random access memory (RAM).

[0147] The memory 701 can store programs. When the program stored in the memory 701 is executed by the processor 702, the processor 702 and the communication interface 703 are used to execute each step of the operation control method of the energy storage device of the embodiment of the present application.

[0148] The processor 702 can adopt a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), a graphics processing unit (GPU) or one or more integrated circuits to execute relevant programs to implement the functions required to be performed by the units in the electronic device 700 of the embodiment of the present application, or to execute the operation control method of the energy storage device of the method embodiment of the present application.

[0149] The processor 702 may also be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the operation control method of the energy storage device of the present application may be completed by an integrated logic circuit of hardware or software instructions in the processor 702. The above-mentioned processor 702 may also be a general-purpose processor, a digital signal processor (Digital Signal Processing, DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware decoding processor, or may be executed by a combination of hardware and software modules in a decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 701, and the processor 702 reads the information in the memory 701, and combines its hardware to complete the functions required to be performed by the units included in the electronic device 700 of the embodiment of the present application, or executes the operation control method of the energy storage device of the method embodiment of the present application.

[0150] The communication interface 703 uses a transceiver such as, but not limited to, a transceiver to implement communication between the electronic device 700 and other devices or a communication network. For example, data can be acquired through the communication interface 703 .

[0151] The bus 704 may include a path for transmitting information between various components of the electronic device 700 (eg, the memory 701 , the processor 702 , and the communication interface 703 ).

[0152] It should be noted that although Figure 7 The electronic device 700 shown only shows a memory 701, a processor 702, and a communication interface 703. However, in the specific implementation process, those skilled in the art should understand that the electronic device 700 also includes other devices necessary for normal operation. At the same time, according to specific needs, those skilled in the art should understand that the electronic device 700 may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the electronic device 700 may also only include the devices necessary for implementing the embodiments of the present application, and does not necessarily include Figure 7 All devices shown in .

[0153] An embodiment of the present application further provides a chip, which includes a processor and a data interface. The processor reads instructions stored in a memory through the data interface to implement the operation control method of the energy storage device.

[0154] Optionally, as an implementation method, the chip may further include a memory, in which instructions are stored, and the processor is used to execute the instructions stored in the memory. When the instructions are executed, the processor is used to execute the operation control method of the energy storage device.

[0155] An embodiment of the present application also provides a computer-readable storage medium, which stores instructions. When the computer-readable storage medium is executed on a computer or a processor, the computer or the processor executes one or more steps in any of the above methods.

[0156] The embodiment of the present application further provides a computer program product including instructions. When the computer program product is executed on a computer or a processor, the computer or the processor executes one or more steps in any of the above methods.

[0157] Those skilled in the art will appreciate that the functions described in conjunction with the various illustrative logic blocks, modules, and algorithm steps disclosed herein can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions described in the various illustrative logic blocks, modules, and steps can be stored or transmitted as one or more instructions or codes on a computer-readable medium and executed by a hardware-based processing unit. Computer-readable media may include computer-readable storage media, which corresponds to tangible media, such as data storage media, or includes any media (e.g., based on a communication protocol) that facilitates the transfer of a computer program from one place to another. In this manner, computer-readable media may generally correspond to (1) non-temporary tangible computer-readable storage media, or (2) communication media, such as signals or carrier waves. Data storage media may be any available media that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and / or data structures for implementing the techniques described in this application. A computer program product may include computer-readable media.

[0158] As an example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage, flash memory, or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. Also, any connection is properly referred to as a computer-readable medium. For example, if instructions are transmitted from a website, server or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio and microwave are included in the definition of media. However, it should be understood that the computer-readable storage media and data storage media do not include connections, carrier waves, signals or other temporary media, but are actually directed to non-temporary tangible storage media. As used herein, disks and optical disks include compact disks (CDs), laser optical disks, optical optical disks, digital versatile disks (DVDs), and Blu-ray disks, where disks typically reproduce data magnetically, while optical disks reproduce data optically using lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0159] Instructions may be executed by one or more processors, such as one or more digital signal processors (DSPs), general purpose microprocessors, application specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Thus, the term "processor" as used herein may refer to any of the aforementioned structures or any other structures suitable for implementing the techniques described herein. Additionally, in some aspects, the functions described by the various illustrative logic blocks, modules, and steps described herein may be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Moreover, the techniques may be fully implemented in one or more circuits or logic elements.

[0160] The techniques of the present application may be implemented in a variety of devices or apparatuses, including a wireless handset, an integrated circuit (IC), or a set of ICs (e.g., a chipset). Various components, modules, or units are described in this application to emphasize functional aspects of devices for performing the disclosed techniques, but do not necessarily need to be implemented by different hardware units. In fact, as described above, the various units may be combined in an encoded hardware unit in conjunction with appropriate software and / or firmware, or provided by interoperating hardware units (including one or more processors as described above).

[0161] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the specific descriptions of the corresponding steps in the aforementioned method embodiments, and will not be repeated here.

[0162] It should be understood that in the description of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; wherein A and B can be singular or plural. Also, in the description of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, wherein a, b, c can be single or multiple. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same items or similar items with substantially the same functions and effects. Those skilled in the art can understand that the words "first", "second", etc. do not limit the quantity and execution order, and the words "first", "second", etc. do not limit them to be necessarily different. Meanwhile, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete manner for ease of understanding.

[0163] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the division of the unit is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. The mutual coupling, direct coupling, or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0164] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0165] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more available media integrations. The available medium may be a read-only memory (ROM), or a random access memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a tape, a disk, or an optical medium, such as a digital versatile disc (DVD), or a semiconductor medium, such as a solid state disk (SSD), etc.

[0166] The above is only a specific implementation of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed in the embodiment of the present application should be included in the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiment of the present application should be based on the protection scope of the claims.

[0167] The device embodiments described above are merely illustrative, wherein the units and modules described as separate components may or may not be physically separated. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the present embodiment. Those of ordinary skill in the art may understand and implement the present invention without creative effort.

[0168] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for controlling the operation of an energy storage device, characterized in that: The method is applied to an electric energy management device of an energy storage system, wherein the energy storage system further includes an energy storage device, and the method includes: Acquire an operating state and a first state of charge of the energy storage device at a first moment, wherein the operating state includes a charging state or a discharging state; If the first state of charge of the energy storage device is not less than the first charging state of charge in the charging state or the first state of charge of the energy storage device is not greater than the first discharging state of charge in the discharging state, obtaining the first operating current, the first operating power and the charging capacity of the energy storage device at the first moment, and the first charging state of charge is greater than the first discharging state of charge; Determine a first target current according to the first operating current, and determine a first target power according to the first operating power; wherein the first target current is less than the first operating current, and the first target power is less than the first operating power; Determine a first target duration according to the first state of charge, the charge capacity, the first target power, and the first target current, wherein the first target duration is the duration required for the energy storage device to reach a cut-off state from the first moment according to the first target current and the first target power, and the cut-off state includes a charging completion state or a discharging completion state; The operation of the energy storage device is controlled according to the first target current, the first target power and the first target duration.

2. The method according to claim 1, characterized in that The determining a first target current according to the first operating current, and determining a first target power according to the first operating power, includes: Obtaining a first attenuation parameter, where the first attenuation parameter is a positive number less than 1; determining the product of the first operating current and the first attenuation parameter as the first target current; The product of the first operating power and the first attenuation parameter is determined as the first target power.

3. The method according to claim 1, characterized in that The determining a first target duration according to the first state of charge, the charge capacity, and the first target current includes: Acquire a first operating voltage of the energy storage device at the first moment, and a first relationship between a state of charge and an open circuit voltage of the energy storage device; Determine a voltage rise of the energy storage device due to a polarization effect according to the first state of charge, the first operating voltage, and the first relationship; Acquire a cut-off open circuit voltage of the energy storage device, wherein the cut-off open circuit voltage is an open circuit voltage corresponding to a second charging state of charge of the energy storage device when the energy storage device is in a fully charged state, or an open circuit voltage corresponding to a second discharging state of charge of the energy storage device when the energy storage device is in a fully discharged state, wherein the second charging state of charge is greater than the first charging state of charge, and the second discharging state of charge is less than the first discharging state of charge; Determining a target state of charge corresponding to the energy storage device according to the cut-off open-circuit voltage and the voltage rise, the target state of charge being a state of charge that the energy storage device can achieve under the influence of the voltage rise and is closest to the state of charge of the energy storage device in the cut-off state; The time required for the energy storage device to reach the target state of charge according to the first state of charge, the first target current, and the charge capacity is determined as the first target time.

4. The method according to claim 3, characterized in that The energy storage device includes a plurality of single cells, and obtaining a first operating voltage of the energy storage device at the first moment includes: Obtaining a second operating voltage of each of the plurality of single cells at the first moment, and determining a second operating voltage of a target cell as the first operating voltage, the target cell being a cell with the highest second operating voltage among the plurality of single cells; The determining, according to the first state of charge, the first operating voltage and the target corresponding relationship, the voltage rise of the energy storage device caused by the polarization effect includes: Determining a state of charge of the target battery cell according to the first state of charge; Determining a theoretical open circuit voltage of the target battery cell according to the state of charge of the target battery cell and the target corresponding relationship; The difference between the second operating voltage of the target battery cell and the theoretical open circuit voltage of the target battery cell is determined as the voltage rise of the energy storage device caused by the polarization effect.

5. The method according to any one of claims 1 to 4, characterized in that: The controlling the operation of the energy storage device according to the first target current, the first target power and the first target duration includes: Determine a second target duration according to the first target duration, wherein the second target duration is shorter than the first target duration; If the second target duration is greater than the preset duration, controlling the energy storage device to operate for the second target duration according to the first target current and the first target power; If the second target duration is not greater than the preset duration, the energy storage device is controlled to operate according to the first operating current and the first operating power until the energy storage device reaches the cut-off state.

6. The method according to claim 5, characterized in that The determining the second target duration according to the first target duration includes: Obtaining a second attenuation parameter, where the second attenuation parameter is a positive number less than 1; calculating the product of the first target time and the second decay parameter; Obtaining the minimum unit time of the energy storage system; The product of the first target time and the second attenuation parameter is rounded down according to the minimum unit time to obtain the second target time.

7. The method according to claim 5 or 6, characterized in that: After controlling the energy storage device to operate for a second target time according to the first target current and the first target power, the method further includes: Acquire a second operating current, a second operating power, and a second state of charge of the energy storage device at a second moment, wherein the first moment and the second moment are separated by a second target time length; determining a second target current according to the second operating current, and determining a second target power according to the second operating power; wherein the target current is less than the second operating current, and the target power is less than the second operating power; Determine a third target duration according to the second state of charge, the charge capacity, the second target power and the second target current, the third target duration being the duration required for the energy storage device to reach the cut-off state from the second moment according to the second target current and the second target power; The operation of the energy storage device is controlled according to the second target current, the second target power and the third target duration.

8. An operation control device for an energy storage device, characterized in that: The operation control device of the energy storage device is used to execute the operation control method of the energy storage device. The device belongs to an energy storage system. The energy storage system also includes an energy storage device. The device includes: an acquisition unit, configured to acquire an operating state and a first state of charge of the energy storage device at a first moment, wherein the operating state includes a charging state or a discharging state; an acquisition unit, configured to acquire a first operating current, a first operating power, and a charge capacity of the energy storage device at the first moment if the first state of charge of the energy storage device is not less than a first charging state of charge in a charging state or the first state of charge of the energy storage device is not greater than a first discharging state of charge in a discharging state, and the first charging state of charge is greater than the first discharging state of charge; a determining unit, configured to determine a first target current according to the first operating current, and to determine a first target power according to the first operating power; wherein the first target current is less than the first operating current, and the first target power is less than the first operating power; a determining unit, configured to determine a first target duration according to the first state of charge, the charge capacity, the first target power, and the first target current, wherein the first target duration is a duration required for the energy storage device to reach a cut-off state from the first moment according to the first target current and the first target power, and the cut-off state includes a charging completion state or a discharging completion state; A control unit is used to control the operation of the energy storage device according to the first target current, the first target power and the first target duration.

9. An electronic device, characterized in that: The method comprises a processor, a memory, a communication interface, and one or more computer programs, wherein the one or more computer programs are stored in the memory and configured to be executed by the processor, and the computer programs include instructions for executing the steps in the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program causes a processor to execute the method according to any one of claims 1 to 7.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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